(1). Professor Allen Plotkin, e-mail: allen.plotkin@sdsu.edu, Professor of Aerospace engineering, San Diego State University, webpage: http://www.engineering.sdsu.edu/jdp/plotkin.html (2). Co-author of "low-speed aerodynamics...",McGraw Hill, 1991 (3). suggest to visit his web page first, then e-mail to him to see whether a copy of the book can be made available, through....(4). Hope this will help.